Instead it has to be manufactured by splitting water into hydrogen and oxygen, a process that consumes energy.

这种依靠人工的将水分离成氢和氧的过程也是需要消耗能量的。

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That takes less energy than splitting nitrogen fluoride and there is no global warming risk, Pilgrim says.

这样能使能量消耗比使用三氟化氮时更少，而且没有促进全球变暖的危险，皮尔格林说。

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Splitting water is one way to solve the basic problem of solar energy: it's only available when the sun shines.

解裂水解决了利用太阳能的一个基本问题：它仅当太阳照耀时可用。

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Fusion is the process of forcing the nuclei of atoms so close together that they fuse into a nucleus of a new element. (Fission, of course, is the opposite: energy produced by splitting nuclei.) The new, fused nucleus weighs less than the original two.

FORBES: A Nuclear Hybrid

Reactors that exploit nuclear fission (in which energy is generated by splitting uranium atoms) have produced thousands of tonnes of spent fuel and other radioactive by-products.

ECONOMIST: Nuclear waste